Microwave emits sparks or arcing inside the cavity during cooking.

Safety: Stop the microwave immediately if you see sparks. Unplug the unit and allow it to cool before inspection.

Steps to address arcing:

• 1. Remove metal objects: Ensure there is no metal cookware, foil, twist ties, or utensils in the cavity.
• 2. Clean the cavity: Thoroughly clean the interior with mild detergent and water, focusing on areas where arcing occurred. Remove burnt food deposits.
• 3. Inspect waveguide cover: Locate the mica or plastic waveguide cover on the side or top wall. If it is burnt, cracked, or has holes, replace it with a Tristar-compatible waveguide cover.
• 4. Check cavity paint: Look for chipped or bare metal areas. Small chips can be touched up with microwave-safe cavity paint. Large damaged areas may require professional evaluation.
• 5. Test with water load: After repairs, test the microwave with a cup of water. If arcing persists, discontinue use and contact a technician.